Gnome System Monitor

In Windows XP, I can always invoke the Task Manager to check the processes, and the CPU, Memory Utilization by typing "Ctrl-Alt-Del'. I could do the same in Ubuntu using Gnome System Monitor. To use the same keys in Ubuntu, just use the following commands:

gconftool-2 -t str --set /apps/metacity/global_keybindings/run_command_9 "Delete"
gconftool-2 -t str --set /apps/metacity/keybinding_commands/command_9 "gnome-system-monitor"